Leetcode 1845. Seat Reservation Manager

アプローチ

• PriorityQueue

class SeatManager {

    PriorityQueue<Integer> pq;

    public SeatManager(int n) {
        this.pq = new PriorityQueue<>();
        for (int i = 1; i <= n; i++) {
            this.pq.add(i);
        }
    }

    public int reserve() {
        return pq.poll();
    }

    public void unreserve(int seatNumber) {
        pq.add(seatNumber);
    }
}